Process of coloring roof-surfacing grit.



. E. J. SCHRODER. PROCESS OF COLORING ROOF SURFAC iNG GRIT; APPLICATION FILED NOV. 3. 19M.

Patented NW 27, 19W

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. EDWA J'. SCHBODER, OF CHICAGO, ILLINOIS, ASSIGNOR TO FREDERICK C. LOEY,

OF CHICAGO, ILLINOIS.

PROCESS OF COLORING BOOF-SURFACING GRIT.

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Specification of'Letters Patent. lPgmem-hgdl NQVO Wt, 1911? Application filed November 8, 1914:. Serial No. 870,117.

To all whom it may concern:

Be it known that I, EDWARD J. SoHRoDnR, a citizen of the United States, and resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Processes of Colorlng Roof-Surfaci'n Grit, of which the following is a speci cation, and which are illustrated in the accompanying drawings, forming a part thereof.

The invention relates to the manufacture of mineral surfaced roofing, and more particularly to a process of manufacturing such roofing by which an ornamental appearance is obtained in the finished product by artificiallycoloring the particles of the mineral surfacing material. -The object of the invention is to rovide an improved method of manufacturlng prepared roofing; and the invention contemplates the coating of the particles of the mineral surfacing material with a permanent color of any desired shade.

In the accompanying drawings- Figure 1. is a plan view showing a frag ment of prepared roofing of the kind which may be manufactured in accordance with the invention, the particles of surfacing material being considerably enlarged; and

Fig. 2 is a sectional view of the same.

In carrying out the invention the prepared roofing is produced by. forming a waterproof body layer 10 which is adhesive upon one side, and by spreading a layer of artificially colored mineral particles 11 upon the adhesive side of the body layer 10 to substantially cover the same. The waterproof body layer 10 may be formed in any convenient way, as by impregnating a felt sheet with waterproof asphalt material in accordance with well known practice the same being made adhesive upon one si e by a liberal application of the asphalt material upon that side, as at 12.

For-coloring the mineral particles 11 I.

prefer to provide a quantity of stock solution with which the coloring pigment is subse quently to be mixed. This stock solution preferably consists of a mixture of a earry-.

ing liquid, a drying oil, and an insoluble soap. F or the carrying liquid I may employ a l9 degree naphtha. The oil, commercially known as Chinese wood oil, is desirably employed for the drying oil, and aluminium palmitate is the insoluble soap which has results.

In making up the stock solution these materials may be mixed in the proportion of eighty gallons of the 4:9 degree naphtha, twenty gallons of the Chinese wood oil, and one hundred pounds of the aluminium palmitate.

The mineral particles to be colored may consist of a sand or gravel in fine particles, or of slate, talc, or other stone crushed into particles of similar size. One ton of such material may be colored by the use of about six pounds of the selected pigment mixed with five gallons of the stock solution. A desirable shade of green for roofing is obtained if a chemically pure chrome green is selected for the pigment material.

The coloring matter consisting of the mixed pigment and stock solution 1s applied to the mineral particles by pouring a selected amount of the coloring matter over the proper quantity of the mineral particles, in accordance with the proportion already given, followed by a thorough agitation of the mineral particles and subsequent application of heat to harden the drying oil which is contained in the coloring matter. The agitation of the mineral particles and application of heat are conveniently accomplished in a steam jacketed revolving cylinder. If desired, however, the application of heat following the agitation of the particles may be omitted, the heating of the colored particles which results from their application to the adhesive side of thebody layer 10" of the prepared roofing while the asphalt material 12 is in a heated condition being sufiicient to harden the drying oil.

Roofing material prepared in accordance with the invention is of a permanent color and owin to the application of color to all parts of t e surface of each of the mineral particles 11 the appearance of the roofingis but little impaired by occasional dislodgl. The process of coloring a eral roof coloring matter comprising Chinese Wood oil and a pigment upon a quantity of the grit, agitating the grit to spread the coloring matter over the entire surface of each of its particles and then spreading the grit in the form of a layer upon a layer of adhesive material While the latter is 1n a heated condition. v

r EDWARD J. SCHRODER. Witnesses:

CHARLES B. GmLsoN, E. M. KLATCHER. 

